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GF Milk Paints are self-sealing so it is not necessary to use primer.

You may use a white pigmented stain-blocking primer if you need to cover grain, paint light or white color on dark wood, or if you're painting a wood that is known to bleed, such as pine or mahogany. We recommend using General Finishes Stain Blocker, Kilz or Zinsser white pigmented shellac-based primers.

Yes.

MDF

1. Apply Kilz or Bin 123 Primer first. 
2. MDF is not as absorbent as natural wood, so wait 2 days in between coats and before applying top coat.
3. MDF also tends to cast a brown color. If you are using a white paint, apply a coat of SeaGull Grey first to counter the brown, and then apply a couple of coats of white over it, allowing all coats to dry 2 days.

Learn more about how to prep MDF before applying GF Milk Paint.

To prep an existing fiberglass door that has a coat of paint on it:

Vinyl or paper veneers can be often found on the end returns of lower price-point cabinets. We cannot guarantee that our paints will adhere well to a paper veneer - we have no idea what the actual material is or what adhesives were used to apply the veneer to the surface. The resins and additives in our paints may break down the adhesives used for the veneer.

And Milk Paint does NOT adhere to vinyl.

The ability of a paint to "hide" (cover) the existing underlying finish color is dependent on a number of factors.

One factor is colorants and the other is filler. Colorants affect the viscosity of durable furniture paints, making some paints thinner than others. GF could add more filler, making Milk Paint similar to wall paint, but that would reduce the durability.

Bright, organic colors such as blues, greens, reds, yellows and whites are thinner. Unfortunately, this a problem common among highly durable paints in the industry.

MDF (Medium Density Fiberboard) is tricky because there are several grades of MDF and the quality varies.

If you cannot determine the quality of the MDF, play it safe and use best practices. The concern is with the edges and ends. The core of MDF is compressed sawdust, glue and resins so when you apply paint to those areas it soaks right up.